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Finding the Fourth Proportional to 18,397,871.20, 27,596,806.80 and 12,658,308.40

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Solution

The fourth proportional to 18,397,871.20, 27,596,806.80 and 12,658,308.40 is: 18,987,462.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,397,871.20 : 27,596,806.80 = 12,658,308.40 : x
  2. Step 2: Convert to fraction form
    18,397,871.20/27,596,806.80 = 12,658,308.40/x
  3. Step 3: Cross multiply
    18,397,871.20x = 27,596,806.80 × 12,658,308.40
  4. Step 4: Simplify right side
    18,397,871.20x = 349,328,891,329,617.12
  5. Step 5: Solve for x
    x = 349,328,891,329,617.12/18,397,871.20
  6. Step 6: Final answer
    x = 18,987,462.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.